Reciprocating grain screen



Oct. 23, 1934. w c WHEELER- RECIPROCATING GRAIN SCREEN 2 Sheets-Sheet l Filed Nov. 11, 1932 INVE NT [1R Oct. 23, 1934.

INVENT UR Patented Oct. 23, 19 34 UNITED STATES 1,978,003 RECIPROCATING GRAIN SCREEN Walter 0. Wheeler, St. Louis, Mo., dedicated to the free use of the Public Application November 11, 1932, Serial No. 642,174 1 Claim. (01. 209-347) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 O. G. 757) This application is made under the act of March 3, 1883, as amended by the act of April 30, 1928, and the invention herein described may be manufactured and used by or for the Government for governmental purposes without the payment to me of any royalty thereon.

I hereby dedicate the invention herein described to the free use of the public to take effect upon the granting of a patent to me. I

The object of this reciprocating grain screen is to have a motion which is simple and efficient, whereby any material which might become lodged in the orifices of the screen will be dislodged therefrom, thus maintaining the screen in a state of high efficiency at all times.

Another object is tohave a screen motion that is uniform so that the agitation will be the same at all parts on the screen.

A further object is to have a practical and durable construction that will not readily get out of order.

A further object of my invention is to provide triple jolts or knocks with each revolution of the cams.

In the accompanying drawings, consisting of two sheets, Figure 1 is a side elevation with frame structure. The pan beneath the screen to carry off the offal which is common to all cleaners is not shown. Figure 2 is a top plan of apparatus. Figure 3 is a front elevation of apparatus. Figure 4 is longitudinal sectional view of screen frame assembly. Similar numerals refer to similar parts throughout the several views.

Screen 1 is mounted on screen frame 11. Screen frame 11 is secured at both ends to screen supports 12 by means of bolts 13. Pins '1 passing through slots 6 engage cam arms 5 at the end of screen riders 12. Slots 6 allow one-quarter inch play for pins 7 in an upward and downward motion. Cam arms 5 extend downward from the end of supports 12 and are connected to cams 3 by pins 2 so as to form an eccentric throw of three-quarters of an inch. Shafts 4 connecting a like arrangement on the other side of screen supports 12 and having the same assembly are synchronized by means of sprocket 8 and chain 9 so that the four cams work in unison. As cams screen stop means.

3 draw cam arms 5downward,screenframe1;1 does one-half inch from its resting position on brackets 10, but speed increases this movement to approximately three-quarters of an inch. 1

This one-fourth inch play in slots 6 of cam arms 5, which are located at the four corners of screen frame 11, give three distinct knocks to screen 1. With the frame 11 at rest on brackets 10, as the cam arms 5 push upward, the lower ends of slots 6 (through which the screen frame is attached to cam arms 5) strike pins 7 to force screen assembly 11112 upward (knock No. 1). As cam arms 5 reach the extent of this upward movement, the speed of the motion pitches screen assembly 111--12 farther upward, the movement being checked by the upper ends of the slots 7 6 as the cam arms 5 start to draw downward (knock No. 2). J erked downward thus, the screen assembly 1--1112 drops of its own accord, and its fall is stopped by brackets 10 (knock No. 3). Upon these brackets the screen assembly rests momentarily until cams 3 have completed the cycleand again started upward.

Knock No. 1 and No. 3 have a tendency to force particles through the perforations. Knock No. 2 tends to dislodge particles too large to pass through and throws them upward.

Screen assembly 1-1112 is set to slope toward one end and the angled ends of brackets 10 serving as guides against which screen riders 12 work, cause the upward motion to be slightly forward so thatparticles too large to pass through the perforations will move forward and off the lower end of the screen.

Having thus fully described my invention what I claim for Letters Patent is:

In a device for sifting, sorting and separating material; the combinationwithastationaryframe structure, of a sloping screen; guide and stop means for said screen; riders on said screen and guided by said means; means for imparting vertical movement to said screen, comprising pitmen eccentrically connected at the ends of said frame and loose connections between said screen and pitmen, whereby intermittent jolts are imparted to said screen substantially at each end of the pitmen stroke, and also upon engagement of said WALTER C. WHEELER. 

